Picking Up the Thread
Mystery-solving readers bolt down the answer.
The owner of the tool presented as April’s mystery, Miguel Angel Hernandez of Veracruz, Mexico, found the item at a flea market. Others found it in their memories.
Richard Hill of Fort Collins, Colorado, remembered that his “grandfather had one when I was a kid on the farm. I made lots of homemade bolts from rods for my projects back in the 50s with it.” It is, said David Voight of Oshkosh, Wisconsin, “a blacksmith die.” “Blacksmiths would make rolled threads on round stock to make bolts,” said Marvin “Butch” Ostman of Baldwin, Wisconsin.
“The numbers by each opening are threads per inch,” said John Kaiserlik1 of Hawkeye, Iowa. “It was tightened onto a shaft and rotated to form threads.…